Rule34.GG

Regular 1boy
1girls
ambiguous penetration
blush
breath
chinese text
class 3-z
female
gintama
implied sex
long hair
looking at another
low-tied long hair
male
monochrome
mutsu (gintama)
no bra
no panties
no visible genitalia
official alternate costume
on back
open shirt
profile
sakamoto tatsuma
school uniform
serafuku
side view
smile
suriran
sweat
teacher
teacher and student