Jon slapped Ashley's hand. If he was going to lose his viriginy, it certainly wasn't going to be under a table in science class (even if he was sort of doing it to himself). But he began to fear what Ashley would do his virginity (among other things). Ashley was also sort of a slut, he feared all sort of diseases that were now creeping into both halves of his body.
By the time fourth period rolled around, Jon was tired of feeling so exposed, but he could only think of a few solutions:
One, go through the rest of his life with a Ashley's bottom half...this he ruled out immediately.
Two, try to wish back his bottom half...after trying this numerous times, he failed...wishes can't be undone.
Three, wish to have Ashley's upper half as well, then wish to swap bodies. He was hesitant to do this as he was unsure if "swapping bodies" would be considered contradicting swapping two halves.
As Jon began to ponder some more, someone slapped his sexy, tight butt, and that pretty much made up his mind....