[Poison Gray (Matsuriuta)] Kozukuri Jouzu na Nazrin Senpai (Touhou Project)

Nazrin-senpai, the mouse-eared treasure hunter with a long striped tail, discovers she's remarkably skilled at conception when her petite, flat-bellied frame proves perfectly suited to "feeling it in her stomach" and guiding things "straight to the uterus." Her partner's warnings about "letting too much out" fall on deaf ears as her hot, flushed body begs for more, already clocking over thirty eager babies on the way. The petite mouse girl soon finds herself with a swollen, pregnant belly, trembling with bliss as her insatiable cravings leave her breathless and craving another round.