Stick to the plan, James.

You remember the plan: get close with Zoe, finish in Jenna. You don't want to fuck that up. There's no telling what Jenna might do if you blow inside Zoe when the whole idea was to help you finish inside her.
You give a few more quick pumps to Zoe's little cunt, then push yourself off and nearly pancake onto Jenna as your arms give out momentarily.
"Oof!!" Jenna giggles... "Easy big guy..." she pulls your mouth onto hers and guides you into that most familiar place.
"I love you, James. Are you going to give me that nut? Give it to me baby, I want to feel it filling me up! I want to feel that warmth making me so full, baby. Come on, please give it to me, you sexy man. Give me your cum baby..." she continues to whisper encouragement.
At first you worry that you may have transferred too early, and that overstimulation may be rising faster than your orgasm. You concentrate on really digging in to the bottom and sides of her cunt, really working the pressure against your cock.
"Shit baby that feels...." that's all Jenna gets out before you suddenly hit the threshold, and a rapid pulsing of semen shoots deep inside her...
"Oh FUCK YES!!!" She screams as you bellow, "Cummmmmming!" It feels so good, so different from when you jerk off. The pleasure starts from deep below, rather than from the head. You flop and thrust and twitch as you empty your balls.
When you finally collapse against her chest, you feel her trembling. She's sobbing. You look up at her with concern...
"Jenna? What's wrong?"
She looks at you with tears streaming down her face, and smiles... "Nothing! I'm.... It's not....it's not..." she can't finish, but you understand...
It's not her.
"Oh Jenna..." you kiss her passionately and with love, keeping yourself snug inside her tunnel. Cum is starting to leak around your base, but you don't care at all. "I'm so sorry for making you feel that way. It's never been your fault. You are sexier now than the first day I met you. And it's only going to get better now that we've shared our deepest kinks." You stroke her hair as Zoe plops down next to you.
"So it worked then?" Jenna grabs Zoe's face with both hands and kisses her.
"You beautiful, crazy little slut. Yes..." She puts a hand on both of your faces now. "I love you both so much."
It's strange. This morning, you would never have guessed that it would sound perfectly right and good for Jenna to say those words. What a weird day.
"And if we keep doing this, eventually, you won't need me here at all."
Jenna frowns. "But...what if we...want you here?" She looks questioningly at you. You nod your head.
"I'm 100% in agreement with you, baby."
Zoe's mouth is hanging open. "I... I thought this was just for helping you guys out... strictly business? You....you...." she looks like she's going to cry...
You pull her close to you, kissing her. "We love you, Zoe. Any time you want, you're welcome in our bed." You peek sideways to make sure Jenna is on board, and she's nodding emphatically.
"You two....you're going to make me cry..." Zoe scrubs her eyes with her palms.
All three of you tiptoe down to the first floor bathroom to clean up. It's the best shower of your life. Sure, you aren't always getting the water with two other people in it, but you can't make yourself complain too much. Everyone helps each other with soaping and rinsing, and a lot of kissing and groping happens.
Making sure the coast is clear, you and Jenna return to the bedroom, collapsing onto the bed, exhausted. Jenna's phone is blinking on the nightstand, and when you check it, you groan.
"Uh oh.."
"What is it?" Jenna looks concerned.
You show her the text.

12:13 (45 minutes ago)
Karen: wtf are yu 3 doin n thurr??/? Killong a cat?
Karen: its fuckon hot
Karen: Ive cum twice jus tlistening

"Shit." Jenna falls back, hand to forehead. "I guess we weren't exactly being quiet."
You chuckle. "I guess we have to invite Karen next time, huh?" You laugh until you see Jenna's face. It's a thoughtful expression.
"Why not?"