Wishing to be part of it.

It wasn't every day that your son and his girlfriend swapped bodies with the hot lesbian couple living next door.

It wasn't every day you found yourself back in a horny teenage boys body.

So when you heard moaning coming from the bathroom that you knew was your son getting freaky with his girlfriend you could not stop yourself from spying on them through a gap in the door they had forgot to lock.

Which got you so hard you had no choice but to masturbate there and then jealous of your son's girlfriend's fingers who got to be knuckle deep in his soaking wet pussy.