BATHING IN BELOVED SISTER

The only thing more wholesome than bathing WITH your sister is bating IN your sister. Surrounded with her body parts everywhere. The cuddling empyrean.

The best part is that it's not just Len having fun at the expanse of Rin. The twins see themselves as two parts of one whole, so in this situation Rin had no concerns that she wouldn't get to experience the fun, because the twins as a whole are still properly having that fun through Len. It's like when you stroke your dick it never occurs to you to think that it's "unfair" that the hand is only giving pleasure to the dick and not getting any in return: in the end it's you as a whole who's experiencing this pleasure. And so Rin was as happy to get cut up for Len's enjoyment as your hand is happy to stroke your dick. And similarly Len doesn't feel bad for Rin's pain and death any more than your dick feels back for your hand doing all the hard work. There's only pure bliss.