Issei×harem Stories

Like every isekai trope, I got hit by truck-kun. When I woke up, I was in the body of a 5 year old. I saw my parents and when I heard this body's name, I freaked out. WHAT DO YOU MEAN I'M DAI?! AM I IN A DXD FANFIC?! I'M FUCKED TO HIGH HELL!!!! But wait, what if I could use my knowledge here to help both Issei and Mari. Maybe I won't end up like a blob or get castrated and paralyzed. Ok then, time to get to planning! Also, I should really stay the fuck away from all those girls!! They're RED FLAGS!!!