You've been on a submarine with a bunch of dudes for 3 months now, so when you get home you're surprised to see your step-sis waiting for you with your bags packed to go to a resort! We have to leave now or we'll lose the reservation! When we get there, though, I noticed you're standing a little funny.... Oh, right... you haven't jerked off in 3 months. Wait, you want me to help you get off? I guess it's the least I could do.