"He's always been that kind of guy"?
Yup, a true hentai protagonist will never let one of his girls feel left out during a situation like that.
That ending though. I guess the 3P relationship couldn't last forever, but I think he kind of goes better with just her anyway. Besides, I'm still holding out hope for the sex friends to lovers possibility here...
Would be interesting if a sequel had him finding out his crush and sex friend were seeing each other behind his back ... really, I'm just imagining his facial expression.
Don't get me wrong, I enjoyed the read, but I got the feeling that the artist tried to put too much plot elements into this 18 pages. Guy bangs sex friend. Guy bangs crush. Guy bangs sex friend. Guy bangs sex friend again. I know the story is called sex friend, but why must the story include so much off story sex friend banging?
This hentai has taught me that friendship is magic and if there's no Waffle House near you, just get the same experience by eating a semi decent breakfast in a gas station restroom. I would say three dying stars out of a possible trillion.