can they made a contract with a human woman too that she can use her power too? sex with a undine is much easier with a slime because they have a stabil body even when they created by water.
I guess in a sort of hindsight it would be best not to get to involed with her. At least that's what I think is would be best for everyone, and more importantly herself.
Gotta love this. Not that I'm extremely interested in sex or something. But the series make me feel like I'm reading some kinds of an interesting encyclopedia or such. :)