My Best Friend Kouta - Episode 4 by Graverobber AXDX

Consider yourself warned and prepare your psyche:
This is a slice of life game heavily focused on Netorare.
In "My Best Friend Kouta", you take on the role of Eisen, whose life could be perfect if not for one detail... His best friend,
Kouta, is extremely perverted.
That wasn't a problem as long as Eisen was single.
But now Evie, his new girlfriend, finds it strange that Eisen puts off so much to introduce his best friend.

As you explore all that Middleriver Town has to offer, date Evie and even make plans for a future engagement,
Kouta will slowly corrupt Evie's mind,
causing her to venture farther and farther into sordid desires, but that always existed.​