Succubus Yondara Gibo ga Kita!? episode 2

Ever since the day she was summoned from a ritual, Erin has been appearing everywhere even though I didn’t call her.
She appears from under her desk while I studying and plays a tutor, or in a public pool and having sex in the pool under the blue sky.
One day, Takashi finds a kiss mark he made on the succubus Erin, then he realized that he’s been having sex with her mother-in-law.