Ask Kuniko to help.

"Hey," you say breathlessly to Kuniko as you hump Sophie's welcoming mouth, "You started this, you should help finish it."

She furrows her brow at you. "What do you want me to do?"

Your mind goes blank for a moment as Sophie pulls back slightly to focus her efforts on your cockhead again. Swirl, swirl swirl, then pump, pump...you can't imagine lasting long like this, but you know you want something more from Kuniko.

"Ah, well, this is embarassing, but can I see your tits? This would be, ah," you grunt, "a lot more satisfying if I could see your tits while I come in Sophie's mouth!"

At hearing you say that, Sophie moans appreciatively, and sucks even harder. You don't know if you can make it.

Kuniko looks questioningly at Diana. Diana shrugs helplessly.

"This is going a little faster than I had planned," your friend responds, "but I hate to interrupt a good thing. Kuniko, you can do whatever you like- your breasts are not necessary for Joe to ejaculate."

"But so helpful," you manage to say through a moan, as Sophie takes you even deeper.

Her face still quizzical, Kuniko looks at you, and then pulls off the sweater she was wearing, revealing a brown bra underneath. You were right, her breasts are larger than Sophie's...in fact, they are quite full.

"All the way?" She asks, gesturing to her bra.

"Yes please!" You say. You're full on humping now, in a trance of pleasure as Sophie's tongue and lips run repeatedly and quickly up and down your shaft.

She smiles slightly, calmly enjoying the situation as you are obviously anything but calm. She reaches back, unclasps her bra, and sets it on her lap, revealing perfect, full, ripe, oh my god. Her nipples, surprisingly, are perking up.

"They're amazing," you gasp, balls starting to clench, "I want them in my mouth!"

"Joe!" Diana protests, "She doesn't have to do that!"

Kuniko, ignoring her, is smiling broadly now. She stands up and moves towards you, bringing her right breast close to your mouth. Without hesitatingly you put your mouth over that perfect, round, firm breast, sucking her nipple, hard.

She lets out a soft, happy gasp and you feel yourself exploding in pleasure, blasting gouts of semen into Sophie's wet, welcoming mouth. You thrust several more times while lustfully sucking Kuniko's breast into your mouth, tongue running over her nipple.

Finally, you're spent. You release your hold from her breast, see her smiling, face just the slightest bit flush now. You look down at Sophie as she withdraws from your cock, mouth brimming with your jizz. She has a rapturous look on her face, as if she's just discovered her new favorite thing to do.

You sigh. She's not the only one.