Biff was nodding off in class, as was his usual, when his phone buzzed. Pulling it out of his messenger bag, he saw that Sarah had ditched class, and wanted to fuck. With a smile, Biff grabbed his shit, waited for his teacher to stop paying him attention, and slipped out of class as quietly as he could. He met up with his girlfriend in an abandoned classroom, one which she had a key to, so they could be alone. The two of them had grabbed some unused crash pad from the gym to use as something to fuck on that wasn't the ground, which both of their knees were thankful for. When he entered, Sarah was already naked, her strange new D-cups on full display, her shaved and pierced cunt ready for action. Biff slid the door closed as easily as he could, flicked the lock, and started to strip.
"How're the new tits, babe" Biff asked, doffing his long sleeved shirt, then fumbling with the zipper on the side of his gray slacks.
Sarah started to fondle one of her breasts, saying "Mmmm...they're amazing. They're so sensitive, I can hardly stand them. I can't wait to get to the mall, so I can get some new clothes to really show them off".
Biff kicked off his shoes, followed by his slacks and panties. He stood in front of his girlfriend, scrawny, pale chest and arms atop thick feminine legs, his pussy framed by a mass of red hair. Sarah unconsciously licked her lips at the sight of her boyfriend's pussy, doing her best to restrain herself. She had a plan for today, and she would be damned if she broke down and just spent the class period just going down on her hot jock boyfriend.
"I had an idea" Sarah said, reaching behind her back to the desk she was leaning on. "What if we tried something new today".
"Hm... what did you have in mind?" Biff said, as he grabbed her waist, pulling Sarah closer to him. Biff started kissing her neck, causing Sarah to moan in pleasure. Focus, she thought, this might be my only chance to convince him.
"What if we tried out this new toy I got? I'm sure you'd love it". Sarah pushed Biff away slightly, then plopped the new toy in his hands.
Biff looked at it, slightly dumbfounded. It was about 14" long, somewhat translucent, and purple. There was a set of fake balls in the middle, and there were two dickheads on either side. Biff gulped. He had never had anything inside of him before, let alone something so big. Even when he masturbated, he only ever used his fingers inside himself to get off, and even then, he never really enjoyed it. He wouldn't even let Sarah stick her fingers inside, For some reason, he felt that using a cock, even one made from silicone, was less than manly.
"I'm not sure I'm..." Biff started, being cut off mid thought as Sarah started rubbing his clit. She reached up and started kissing him deeply, moving her hand over his body until it reached the hand holding the double dildo, taking it and setting it down on the desk. Biff grunted in pleasure, taking his now empty hand and filling it with Sarah's large breast. She jumped as he tweaked her nipple, still not used to the changes that mysteriously happened yesterday. As she broke off the kiss, she guided Biff down to the mat, picking up the dildo again.
Biff was still unsure, but his hesitation slowly faded away as his girlfriend started kissing him again, making her way down to his pussy. He half expected her to start sucking his clit, but instead she started rubbing one of the heads of the dildo against his labia. Biff was shocked at how good it felt, especially since Sarah mixed things up by flicking his clit with her tongue every once in an while. Sarah, seeing the look on Biff's face, smiled a wicked grin. "Ready?" She asked. With a quick nod of assent, Sarah shoved the dildo into her boyfriend's cunt. Biff gave a shout as he took 7" of purple silicone into his formerly virgin pussy, surprised by how much he was enjoying the feeling. Sarah waited a few moments, giving him time to adjust to having such a large object thrusted into his vagina, before snaking her legs between her boyfriend's and taking the other half of the dildo into herself.
It took them a few minutes to find a rhythm. For Biff, the biggest issue was that every time either he or Sarah moved, the dildo hit some new place inside of him, causing him to spasm in pleasure. These spasms caused him to shove the other end deeper into Sarah, who was fairing better in that regard. She was used to having a dildo inside her, since Biff had insisted on using the strap whenever they used one previously. Eventually they found a pattern that worked for the two of them, riding the purple dildo together for what felt like an eternity, until Sarah finally came, collapsing onto the mat with a very contented smile on her face. She looked up to she her boyfriend taking the dildo out from her pussy, using the other end to work his gaping hole, a look of pure bliss on his face. Biff continued to fuck his pussy with the toy, pleasure building faster and deeper than he ever thought possible, until he finally came.
"Holy FUCK!" Biff screamed as the orgasm finally hit, purple dick still deep within his pussy. Liquid also sprayed as he came, drenching Sarah as she watched.
"I didn't know you were a squirter" Sarah said. "That's so hot".
Biff was panting hard, his eyes slowly starting to regain focus after the monster orgasm. "Neither did I. I can't believe how great that felt".
"Well, now that we know, maybe later today you let me have a go with the strap?"
Biff smiled, already getting turned on by the thought. "Sounds like a great idea, babe".
Sarah smiled, and started to get her clothes back on when she heard someone walk up to the door and start to fumble at the lock. "Shit", she said, grabbing her stuff and doing her best to hide in one of the closets in the room. Looking through a crack in the door, she saw one of the new teachers, Mr. Delgado, come into the room, obviously concerned about the yelling he must have heard. Sarah had a bit of a crush on Mr. Delgado, to be honest. He was in his late twenties, had an athletic build, and was rather charming. He was also married, and was absolutely devoted to his wife, Rebecca. Sarah thought something was off about him, briefly, before going over a checklist in her head. He was wearing a dark gray button down shirt, black sports coat, light pink jeans, and his purple Converse. Nope, she thought, everything seems normal. Mr. Delgado gave Biff quick look, told him to get dressed and get out of here, and that he would have to stay after for detention. Sarah saw that Mr. Delgado was blushing as he left, probably embarrassed seeing the school stud naked and in a post-orgasmic state. Waiting for a five count, Sarah left the closet, slowly getting her remaining clothes back on.
"Thanks for not throwing me under the bus" Sarah told Biff, who needed help standing up.
"Of course". Biff said. Even after getting to his feet, he had trouble standing, let alone walking. Sarah gave him a hand to the desk, which he leaned against as she gathered his clothes, helping him get dressed.
