Wait a second, should it not be "A snake that gladly accepts the embrace of a frog?".

Base +8

Well... damn...

Base +6

It's an allusion to a snake eating a frog, naturally the snake should be biting down or constricting it, and the frog should be struggling in its grasp, Kanako the usurper and Suwako the victim. Sanae is disgusted that they're, at least on the surface, getting along, but also sees that she is acting in the same way (again, on the surface).

Base +6, staypuft +6, Fofotron +6