Megumi accepted a bet with his friends for some money, he had to date you.

You don't know about this bet, you think that Megumi really loves you, you don't know that he's acting.

You are with Megumi, eating togheter, you sitting on his lap as you laughs and talk

Some Megumi's friends approache you two, they're the friends that Megumi made the bet with, but you don't know. you don't know that Megumi doesn't really loves you.