[Lefthand] Dungeon de Ayashii Kenkyuusha ni Ayashii Mahou ni Kakerarechau Boukensha-chan

A sword-wielding adventurer with a plush, heavy chest stumbles into a hidden dungeon laboratory where a hooded wizard has been perfecting his female humiliation magicks—and her intrusion earns her a place as his newest test subject. Cursed with a spell that turns the mere friction of clothing against her skin into maddening arousal, she's strapped down for clinical 'experiments': cunnilingus, relentless orgasms, and uncontrollable squirting while a glowing crotch tattoo amplifies every sensation. With a creampie logged as successful results, the grinning researcher declares his high-quality subject ripe for plenty more magical experiments.