Swapping in the Sense of Guilt -- Haitokukan Swapping

Two couples. One pair consists of serious-minded individuals, while the other is a slightly flashier combination. But both couples were equally troubled by their sex lives becoming stale lately. So they came up with the idea of a double date. By dating together, they aimed to break out of their rut.

But during the fun date, an accident happened while boarding the Ferris wheel. They were hurriedly loaded onto the ride, ending up paired with the wrong partners. Trapped in the cramped cabin, compounded by their own relationship stagnation, the atmosphere naturally grew intense... Feeling a thrill from the forbidden excitement of touching their friend's girlfriend, their hands began to reach out toward her body...

The chapter list for this manga is:

1. Forbidden Swapping Episode 1
2. Forbidden Swapping Episode 2
3. Forbidden Swapping Final Episode
4. Sis Toy Part 1
5. Sis Toy Part 2
6. Gyaru's Country Life
7. Dreams And Reality
8. The Part-Time Job Where Anything Goes