Mori no Kuma-san, Toumin-chuu.

I can't believe it... were you sucking on my nipples all this time while I was hibernating...!?
(Source: Coolmic)
Note: Serialized under the title "Mori no Kuma-san, Touminchuu ni Chikubi wo Mederaremashita. (森のくまさん､冬眠中に乳首を愛でられました｡)".