Series: Original - We Got a Sexy Onee-san for Christmas (Kemuri Haku)

Japanese title: クリスマスプレゼントにエッチなお姉さん買ってもらった
Romanized title: Kurisumasu-purezento ni Ecchi na Onee-san Katte moratta
Artist: Kemuri Haku

A father gives his precious sons the gift of onee-san for Christmas.