A wife who is weak to pressure gives birth to an unlimited erection monster! When her brother-in-law, who is still a virgin despite being an adult, asks her to take his virginity, Luna can't refuse and ends up helping him lose his virginity. The sex feels so good that her brother-in-law's mind is filled with thoughts of sex! Luna is attacked by a sex beast that has become a non-stop rampage monster. Even though she has been cumming so much that she has reached her limit, he keeps attacking her! Even when the condom runs out, he keeps pounding her with a raw creampie piston! He is completely defeated by his amazing sexual prowess!