[TANTAN (Tannu)] I've Been Secretly Having Sex With Our Captain [Black Grimoires]

A baseball teammate and the captain can't stop sneaking off together, and every practice risks blowing their cover wide open. Muffled groping in the grass while he bites his sleeve to stay quiet, an apology that leaves one of them ass-up on the diamond, and a club-room shower where a forgotten lock earns a bare-handed spanking—all of it builds toward sweaty, nakadashi-fueled surrender. Subaru and his toned, blushing teammates squirm through every hidden encounter, proving that secret sex with the man in charge is worth the thrill of almost getting caught.