Hentai Manga like Soubo Soukan

Futabo

Status: Finished
Genres: Hentai

Wakana Seito lives in blissful confusion. His father remarried to a beautiful young woman named Kada. Now he's gone and Kada has raised Seito on her own. Now he's a young man--with adolescent fantasies about his step-mother. But then his aunt, Kanna, is coming for a visit. Seito awakens from an afternoon nap and spies his mother in the shower. But his step-mother isn't upset at all to catch him spying on her--and she's very glad to see him--!

Soukan no Replica

Also known as Replica of Mother.

Status: Finished
Genres: Drama , Hentai

Soukan Replica by Mitarai Yuuki is a story of a boy lusting after his actress mother. Her older sister catches him masturbating to a show in which his mother is starring on TV and tries to "help" him get over his infatuation.

Chibo Soukan

Status: Finished
Genres: Hentai

Ryokan Soukan (旅館相姦); COMIC Masyo 2017-12
Mama-tachi no Ojuken Sensou (ママたちのお受験戦争); COMIC Masyo 2017-10
Asedaku Soukan Kikyou (汗だく相姦帰郷); COMIC Masyo 2017-08
Musoko no Tame ni...: Cosplay suru Haha (息子の為に...～コスプレする母～); COMIC Masyo 2017-06
Kinga Shinnen (禁賀新年); COMIC Masyo 2017-04
Hitozuma Seikan Reflexology (人妻性感リフレクソロジー); COMIC Masyo 2017-02
Chibo Genka: Nagusame Soukan (痴母げんか～慰め相姦～); COMIC Masyo 2016-12
Bath Romance (バス浪漫ス); COMIC Masyo 2016-10
Seishori Haha (性処理母)

Ika ni Shite Haha wa Onna wo Kaihou Shita ka

Status: Finished
Genres: Hentai

Mama-goto

Status: Finished
Genres: Hentai

Contains 7 stories:

Sexy Single Mom (Married womom)
Sperm Donor (Fertilized production)
Hot Mom (The mother wife that sexual desire matures)
Sex Teacher (Sex job person) (1-3)
Annoyance (It is asked)
Makeover (Girl rebirth)
Hot Housewife (Family wife luster)

Onee-chan to, Mama to, Honki Koubi.

Status: Finished
Genres: Hentai

vol.1 Mama-san Volley Buchou-hen (ママさんバレー部長編)
Suiei-Bu no Hogo-Gakari-hen (水泳部の保護係編)
AraAra Uwaki Mama-hen (あらあら浮気ママ編)
Yankee-chan-hen (ヤンキーちゃん編)
Rikujobu-chan-hen (陸上部ちゃん編)
Kakioroshi (Rikujobu-chan-hen no Tsuzuki) (描き下ろし (陸上部ちゃん編の続き))

Boku wa Kanojo no Marmot!

Status: Finished
Genres: Hentai

1-4. Boku wa Kanojo no Marmot! (僕は彼女の実験体！, I'm Her Guinea Pig!)
Soukan Twins (相姦ツインズ, Incest Twins)
Horete♥Osowarete: ♥Two Lovers♥ (ほれて♥おそわれて♥TwoLovers, Two Lovers)
Soukan Kazoku 2: Musuko no Zamen ni Oboreru Haha-tachi (相姦家族2, Incest Family 2: Moms Drowning in Their Son's Sperm)

Niji no Ori

Status: Finished
Genres: Hentai

Fugou Ichizoku no Muko: Tsuma Igai Zenin Ore no Onna

Status: Finished
Genres: Hentai

1-6. Fugou Ichizoku no Muko: Tsuma Igai Zenin Ore no Onna (富豪一族のムコ 〜妻以外全員オレの女〜); Comic Kuriberon DUMA Vol. 36, 39, 42, 44, 48, 50.
7. Oba-chan no Waki to Oshiri to etc.... (叔母ちゃんの腋とお尻とetc....); Comic Kuriberon DUMA Vol. 27.
8. Oba-chan no Waki to Ase to Futari no Ashita (叔母ちゃんの腋と汗と二人の明日, Auntie's Armpits, Sweat and Our Tomorrow); Comic Kuriberon DUMA Vol. 32.
9. Fugou Ichizoku no Muko: Tsuma Igai Zenin Ore no Onna - Kakioroshi (富豪一族のムコ 〜妻以外全員オレの女〜 描き下ろし)

Boshi W Soukan

Status: Finished
Genres: Hentai

It's a single volume with a short series and some one-shots by Izayoi Seishin and written by Yamasaki Masato