I'm Dating a Dark Summoner - Dark Summoner to Dekiteiru

Synopsis

Amona, a dark summoner and demi-human girl who's too weak to resist her desires, and Roni, an overly serious priest! Roni welcomes Aruni as a new member to his adventuring party. Everyone expected the two would clash and become sworn enemies. But, to their surprise and on their first day together, they have a one-night stand...!