Quantum Suicide - Nikolas Ending (Male)

In the case of the siblings, they are only attracted to females, so doing their routes on the male side will result in friendship endings. You can see that in the end, Nikolas apparently ends up with both his sister and Kimiko, and the former is not eager to share with the latter. Luckily, we get to bow out before seeing how awkward things can be in that small ship between the three.