On the first day of Summer vacation---- An angel arrived at my house. The mech angels protect our city from the "enemy." However, when one such angel is no longer capable of fighting, they are provided to the city's citizens... That's what I learnt, but never did I imagine even in my wildest dreams that this was what it was for----!! After having sex for the first time, my father and mother (who is actually an ex-angel!) show me how it's done. Supposedly, sex feels even better when your partner is feeling pleasure---- From there, I end up living together alone with my own angel!? As I indulge in sex with her... slowly but surely she begins to turn lewd with lust... I too wish to give her a pleasurable experience...!!