"Whoa", said Matt, in that deep voice Ty wasn't used to hearing.
"Are you alright?", asked Ty.
"Yeah, yeah, I'm fine", whispered Matt back.
Ty looked down at Matt's crotch and sees that Matt's underwear is bulging slightly.
"Aah", whispers Matt.
Matt feels a tightening in his underwear, that feels weird.
Ty looks down and see the bulge becoming bigger and bigger, it must be nearly 8 inches by now.
"Wait, I didn't say when he should stop growing, did I?" Ty thinks to himself. Ty decides to let Matt get a LOT bigger!
Ty glances over again and sees that Matt's pants are just filled, barely containing Matt's manhood.