He suddenly felt a tingle in his penis.
"Huh...guess im horny!"
He chuckled to himself and watched his jeans tent with his erection, but just when it reached normal size it continued to grow, tenting his jeans further and causing them to strain.
"w-wha? What's happening to me?" He moaned uncontrollably as his penis was beginning to strain in it's tightening confines, trying to burst free.