Grab Marina's cock while you lick her balls

Still attending to her ballsack with your mouth, you push one hand up under her dress and find her hardening length. It's quite impressive, though you can't tell the exact size yet. Much of it is still inside her panties, but a fair bit is poking out. You start rubbing and stroking her. "Oh, fuck," she says. "Yeah, that's good. Rub that dick. Mmm, bitch, you're gonna make me bust!"