Dark Souls (2011)

Gwynevere wears a dress that exposes moderate cleavage

Chaos Witch Quelaag, a boss in the game, has a lower body of a demonic spider and upper half is human. Her upper half is mostly covered by her hair but some cleavage can be seen. This all plays out in a cutscene that almost entirely focuses on her chest before the boss fight but during the actual fight you can only notice that she is shirtless.

It is also possible to visit Quelaag's sister, who is also a spider with a young woman's upper body. She also has long hair the covers breasts but has cleavage.