AIAV-027 [AI Doujinshi] I'm still a virgin but I have a big dick, so it seems a perverted succubus liked me

When I recited the spell according to the grimoire, a succubus really appeared. They say that succubi suck out the life force… I was still a virgin, but it seems that I had an attractive big penis. Because of that, the succubus took a liking to me and made me her sex friend…