Sorry if this isn't the right place, but thought I'd ask anyways.
I'm looking for a doujin where the MC goes on various FaceTime calls with his girlfriend, who is working overseas. During these FaceTime calls, the GF gets increasingly sexual with her boss, but always tries to keep it under wraps from the MC, who is still in the call.
Lots of implied sexual acts occurring out-of-frame, as well as 'sneaky' sex, and there was a scene where the BF and GF started having phone sex, but unbeknownst to the MC, the GF was getting railed, with the usage of a towel/blanket to mask the boss thrusting in and out of her.
At the end the boss becomes sadistic and tells the BF that his GF has been cheating on him, and gives him an extra hardcore performance, with the GF unaware that this particular encounter was being recorded.
Edit: After spending an entire evening trying to find it, a quick half-assed search for it gave me what I was looking for:
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Your tried checking here on F95 first? It's been around for almost 4 years. I quite liked it cause it's colored and there are those calls/mystery elements.
