Marika is so thirsty she either throws her self at him or has a normal conversation with him while he gets an accidental hand full of her boobs. There is no other option with her, why because she likes him. If it were anyone else, they would either be dead or in a full-body cast. This is her one personality trait outside of being friendly and a good cook. Which seems to be her base standard since her gape-moe is featured with her superhuman strength.
TLDR: Marika is boring and Horny for Darrel