Vibration

You smile at Sophia and turn the "Vibration" setting to "on" with a medium intensity. Your cock suddenly starts humming quietly in her hand, and she gasps, looking up at you. She bites her lip. "Alex. I want to feel you... inside me." You reply softly, "be my guest." Sophie gets up and straddles your lap. You notice a distinct wet patch on the front of her thong. Wasting no time, she grinds against your vibrating cock, moaning deeply. "Fuck, this feels so good." You press against her in response, grabbing her hips. She humps you for a bit, grinding your dick into her clit and breathing heavily. Having her use your cock as a sex toy turns you on more than you were expecting. You're glad you turned off your ability to cum. Her movements increase in speed until she whispers, "Please fuck me."

Pulling her thong to the side, you take in your friend's dripping pussy and neatly trimmed bush. You moan in response and press against her opening. Remembering a setting you saw on the phone, you look back at the screen. You turn off "Ability to Impregnate" and go to put the phone down before seeing "auto-lubrication". You shrug and flip that on. Immediately the outside of your cock feels slippery as it self-lubricates. It takes very little encouragement to guide your cock into Sophia's pussy, and she wraps her arms around your neck as she cries out. She continues to grind against you, rocking back and forth with your dick sitting deep inside her.

The implant is pleasuring you automatically, and you aren't going to cum unexpectedly, so you sit back and enjoy the experience. Sophia gets noticeably worked up as she bounces on your cock, which slips easily in and out. You moan in appreciation and she kisses you deeply, which you return. Breaking away from the kiss, she starts to whisper "fuck, yes, please" under her breath. You take this opportunity to check the app again. You flip back a page and notice a setting for "size". You smile, and slowly turn the setting up. In shock, Sophia gasps "Ung, oh fuck. Are you doing that? Fuck me, fuck me, don't stop." With that encouragement, you increase the size of your dick again, feeling it press against Sophia's insides. You grunt as you've been on the verge of cumming for a few minutes now. Sophia bends over backwards as she takes your growing cock, bouncing with a renewed vigor. Despite the size, the automatic lubrication does its job and you're able to grab her hip and thrust into her.

Sensing her being on the verge of her own climax, you flip back to the vibration settings. You whisper into her ear. "Do you want me to make you cum on my cock?" She looks at you knowingly and, unable to speak properly, nods vigorously. You grin and turn up the vibration settings, feeling your dick start to hum at a much higher frequency and power. Sophia screams in pleasure and pushes herself down on your cock, legs spasming as she cums on you. Using a hand to hold her down, you hold her at her climax for a few seconds before grunting "I'm gonna... cum... in you!" and turning back on your ability to orgasm. Instantly, your dick erupts deep inside your friend and you groan in pleasure as you feel your cum plaster the insides of Sophia's pussy. Still screaming, she continues to grind on you. After cumming, your dick feels extremely sensitive and you quickly turn down all of the settings until you're back to normal. Sophia collapses on top of you with your cock still inside, twitching. You feel your cum start to leak out and run down your dick, and you embrace your friend, both of you breathing heavily.