Glaze my tits before stepmom walks in

Your stepsister comes in, big tits swinging in her T-shirt, no bra on. She sits down, steals the TV remote from you, bragging about how her tits are better than those anime girls you watch. Eventually, you end up on a porn channel, desperately hoping your stepmother doesn't walk in on both of you watching the footage. Then... she turns to you, emphatic that her tits are better, and proves it by showing them to you. You can see your stepsister's breasts. In return, she wants to see your cock. Impressed by your size she offers you an evil challenge. She wants to tit-fuck you--- but she wants to see if you can actually cum before your stepmom walks in-- and she could enter at any moment. If you can make it all the way through-- even with your stepmom standing right there-- she'll buy you that computer you've been saving up for... Are you ready?