Yuri mo Arukeba bo Niataru! – Chapter 1 Scene 3

Series Page
Raw Chapter Link (Pages 59-84)
Rating: 5

Continued from the previous scene, the girls get aroused by the MC, so they tie him down on to a bed and have a threesome with him.

At the end of the chapter, they tell him that he’ll be their sex toy from now on and nothing more.

This is labeled as chapter 1 and ends with a “to be continued,” so there will more more chapters eventually.

Jogakkou de Otoko Hitori na node Kousoku de Seiyoku no Hakeguchi ni Sareru Nichijou – Chapter 4 Scene 2

Series Page
Chapter Link (Pages 51-64)
Rating: 4

The MC has a foursome with Aoi, Lilliana and Midori.

On Pages 54 & 57, Aoi and Midori are briefly shown having lesbian sex in the background while the MC was having sex with Lilliana.

The MC quickly rejoins afterwards, so it remains a foursome for the rest of the scene.