No.

After having relieved the pent-up sexual frustration you didn’t even know you were holding, you and Shelly make out for a long time. You knead her tits and she strokes your cock as you kiss, but neither of you make attempts to make the other cum. You relish in your sister’s touch, a woman’s touch, a lover’s touch.

Shelly is the one to stop the make out session momentarily. She looks at you in contemplation as she wonders something.

“Say, you really ARE a virgin, right?” She asks.

You swallow and nod.

“Then, as much as it pains me to say it, I don’t think we should go any further than this.”

What? WHY!?

“Why!?” You voice your thoughts.

“Look, even though we’re both okay with this, we’re still siblings,” She says. “and before you think I might get pregnant, don’t. I’m on the pill.” She admits. “What I mean is, we can’t very well be boyfriend and girlfriend, right?”

You nod tentatively.

“Look, I’ve been thinking for a LONG time about a way to make this work, and I mean YEARS, and I think I have a plan.” She tells you, and you realize again that Shelly has been hiding this for longer than you thought. “Here’s the thing. I’m really tempted to put your cock inside me right here, right now,” She says, “but what we need is for you to get a girlfriend who is willing to share you with me. That way, people won't get suspicious. Chances of you getting a girlfriend are higher if you keep it for now.”

“Are they?” You asks skeptically.

“Look, I really believe that virginity is overrated, but I’m in the minority there. Believe me, the first girl you do it with will be THRILLED to know she’s your first. Hell, even I want to be your first, but I’m making a long-term investment. Hopefully not that long though.”

“So you’re okay with me having a girlfriend?” You ask.

“Of course!” She says. “If you have a girlfriend, and eventually a wife, no one will even suspect of us having a thing.”

Okay. That’s good actually. However…

“…does that mean you’re going to get a boyfriend too?” You ask nervously.

Shelly stares at you blankly for a moment before she smirks teasingly.

“Aww, what’s that brother? Are you feeling jealous? You don’t want me to get fucked by another man? Do you want all my sexy self to yourself?” She teases you, running her fingers all over your body.

You swallow again. “Would you hold it against me if I said I did?” You answer. “I WOULD feel jealous if you had a boyfriend. I DON’T want you to have sex with other guys and I DO want you all to myself.” You tell her honestly.

You’re being greedy. You’re being so fucking greedy it wouldn’t be surprising if your words had screwed everything up.