Official website
#1: https://bitjam.nan-net.com/magazine/comic_view.php?code=himitu
#2: https://bitjam.nan-net.com/magazine/comic_view.php?code=himitu2

#1 秘密(前編)
弟からのプレゼントはSMの拘束具!?動けない私に無理やり…(12P)

#2 秘密(後編)
姉と弟の秘密の関係…。姉ちゃんはオレの奴○だ!怒涛のクライマックスへ突き進む…(12P)

Secret #1
My little brother gave me physical restraints as a present!?
12 pages

Secret #2
My relationship with my elder sister is secret... She's my sl*ve!
12 pages

DLsite
#1: https://www.dlsite.com/maniax/work/=/product_id/RJ240819.html
#2: https://www.dlsite.com/maniax/work/=/product_id/RJ240820.html