Landolt book that doesn't have bittersweet ending? Holeh o O
Page 18 is quite hilarious with a slight role reversal. Basically the girl comments that the futa have gotten good at sex. The futa says she's been touching herself to figure out which spot makes it feel good. The girl obviously teases her about it. But the futa honestly confess that she wants to make the person she likes happy.
And the last panel is just the futa asking why the girl is hiding her face, even saying she likes to do it while looking at her face.