Unfortunately, the note was horribly vague on the matter of actually using magic. It basically said, "here's this really cool toy, which will cause changes to your body when you hold on to it, but each use relieves those changes. However, we're not going to tell you how it's used." Cause that's soooo helpful.
Jon checked the time again. 2:59. Okay, that gave him several hours to attempt to either fix the problem or make it so that no one would notice. All thoughts were forcefully driven out of his head though, when the clock struck 3.
It suddenly felt like someone was slowly filling up his breasts with warm, slow moving molasses. It poured in, filling up the confines of his chest, and when there was no more room left, the breasts began to expand. It was a slow, gradual growth, pushed forward and outward a by the ebb and flow of an invisible tide. The gentle but continual warmth coupled with the feeling of sensitive flesh growing was so erotic Jon went weak at the knees. Finally the growth and the earth ceased, leaving Jon weak, aroused, and one cup size larger than before.
These new C cup breasts a had a little more heft compared to previously; as Jon's chest heaved while he tried to catch his breath, his breasts bounced and jiggled right along. He made the mistake of looking straight down into his newly expanded cleavage, and immediately got what would have been the worst case of morning wood ever, if he had still been asleep.
Tearing his eyes away from the alluring sight, Jon commented to himself, "Yeah, these things are going to have to go. But how?" Jon began pacing his room, trying to find an answer, and he was so engrossed in his thinking that he didn't even notice the renewed jiggling in his chest.