Second of course

"I'll go with the second option" you say

"Double or nothing without even knowing the full bet, I'd say that takes balls, but..."

"Just tell me the rules." You say curtly.

"You're no fun.... Alright, the first condition: You can no longer reach orgasm by yourself. Same goes for your sister naturally. If you want gratification of the sexual kind, you'll have to ask someone else politely."

_That rules out locking my room and staying here until time's up. _You thought. "What else?"

Now for the second condition: You may have noticed it already, but your sister is getting progressively more... assertive, as time goes on. I know she promised not to cum inside you, but as you know you know all to well how forgetful she can be if she's pent up too long. She's currently about to wake up, and as things stand you'll find it quite difficult to avoid getting another creampie even tonight. "

The image of Gwen pinning you down as she fills you to the brim again flashes in your mind, making you shudder in both fear and lust. "G-go on.."

"The final condition. You cannot tell her or anyone else about this deal, you'll have to convince her by other means to cum anywhere else except inside her favourite spot."

"But what if she won't listen to me no matter what?"

"Then congratulations on the twins in nine months. As a head start, I would recommend looking in your parent's closet for something that can help. Oh and if you fail, don't beat yourself up too bad. As you are right now I'm sure you capable of keeping Gwen quite happy. Good luck!" The line went dead.

You ruminate on everything you've heard. From waking up to Gwen cumming inside was about half a day. With what she said you'd be lucky to last half an hour.