"Brother, are we really taking a bath together?" 
 
And so, a forbidden bathing experience began. Me, my sister, and childhood friend—one man and two women—are sharing one bath. After involuntarily "overflowing," the sister's secret love come out?! 
 
This is a young romantic comedy that won't let you say, "it's over!" 
 
(Source: Official Site, translated)

"Can't... keep my... voice down." Nii-chan thrusting in me again and again. We shouldn't be doing this as siblings... so, why does it feel this good...?
 
(Source: Coolmic)
 
Volume 1: Overflow: Iretara Afureru Shimai no Kimochi (おーばーふろぉ〜挿れたら溢れる姉妹のキモチ〜) 
Volume 2: Overflow: Toaru Kyoudai no Kindan Seikou (おーばーふろぉ〜とある兄妹の禁断性交〜) 
Volume 3: Overflow: Atsuku Majiwaru Shimai no Taboo (おーばーふろぉ〜熱く交わる姉妹のタブー〜) 
Volume 4: Overflow: Nagisa ni Matsuwaru Shimai no Fushidara (おーばーふろぉ～渚にまつわる姉妹のふしだら～) 
Volume 5: Overflow: Uzuku Shimai to Higawari Seikou (おーばーふろぉ ～疼く姉妹と日替わり性交～) 
Volume 6: Overflow: Nozoku Shimai no Seiai Jijou (おーばーふろぉ～覗く姉妹の性愛事情～) 
Volume 7: Overflow: Cos Shimai no Sakusei Yokkyuu (おーばーふろぉ～コスる姉妹の搾精欲求～) 
 
Notes: 
- Originally serialized as a web manga under the title Jitsu wa Ima Haittemasu....: Ofuro de Onii-chan no Katai Are ga... (実は今入ってます…。お風呂でお兄ちゃんの硬いアレが…っ). 
- Simultaneously released in long-strip format for mobile reading with each chapter split into 3 ‘episodes’.

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