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He is Yomogawa Shiina, but with a bunny suit.
Not from a doujin, but from some cg images drawn by the group Negisiomeron.
You can find them on hitomi.la
Card:
lilacdreamers
OneeKitsune
なお
kagetodev
andun
TEA.O.
Hajx
brome
cactigang
unsol_iel
Morphicfields
Eden
Mickhafrost
スピカ&ドリー
aoisakai
Joe
ひょがよめ
MilarS
ghuraok
Novakg
seraphina
Hastum
SekAI
Project Luna Bunny
Owner
QuarT0niX
あかひ
Hanukami In Wonderland!
Shannon Converse
galaxycoopz
秋空広樹
XTC
Sacred Debris
TimothySoup
foxxsimmer
chos69
ChaosExceed
Amalia
dmayaichi
koenage
ちか
Mr.B
kroc
bcguro
nikkeuser
ADV1SAGE
Wanuze
Ham's Art Shack
bigsofttitty
xenbis