Underfoot

Underfoot is a netorase (cuckold) visual novel with a focus on foot fetish and optionally pantyhose. It contains elements of moral degeneration.
Story
Your wife Mia has always known about your foot fetish and even indulges you. But she doesn't know about your other fetish, the one you've kept a secret from her: you like to imagine her getting fucked by other men.
One day Mia does discover your fetish and once again is willing to indulge you by inviting a third person to your marital bed. But what changes to your marriage will inviting your neighbor to join you in a threesome with your wife set in motion..?
Characters

Mia (voiced by Misuzugon) is your wife. She is open to explore things sexually with you, even more so than you had initially thought.
Your neighbor is called Zack. He seems pretty open to joining you and Mia in your sexual exploration, perhaps unsurprisingly.
Gameplay
Underfoot is a visual novel with several different choices that can lead you to different endings. You can rename characters or use their default name. At the start of the story you can choose whether you want Mia to wear pantyhose or not, which will affect many scenes in the game.