kosmos beta, nakano nino, uesugi fuutarou, go-toubun no hanayome, commentary request, highres, 1boy, 1girl, bathroom, blunt bangs, breasts, butterfly hair ornament, completely nude, fingering, grabbing another's breast, greyscale, groping, hair ornament, hair ribbon, hetero, in bathtub, large breasts, long hair, mixed-sex bathing, monochrome, navel, nipples, nude, open mouth, partially submerged, reach-around, ribbon, shared bathing, short hair, smile, two side up, wet