Uwakoi

Yukiteru is living with his family friends, after playing with candles and accidentally burning his house down as a child. Unfortunately, Yuno reacted poorly to them moving out to their own home when it was finished and it was time to leave, so they have continued to do so for years. Now in high school, they are living their life as normal until Rena, who is jealous of their closeness, makes a surprise move.

Another Ecchi manga by Masahiro Itosugi, Uwakoi revolves around a growing love triangle between Yuno, Rena and Yukiteru.

Tropes used in Uwakoi include:

Catapult Nightmare: Yukiteru has them frequently, remembering his house burning down. It may be subverted -- at the end of chapter one, he points out that he actually found the destruction beautiful.
Fan Service: Yuno's spandex leaping in chapter one, then Rena's School Swimsuit right afterwards.
Genki Girl: Yuno
Good People Have Good Sex: Mostly averted. When Yukiteru and Rena have sex, its not very healthy and normal. As of 7th chapter, they are having sex during Rena sleepover at Yuno and Yukiteru house, during which Rena smothers him with pillow to make him quiet, lampshading it looks like she is murdering him - which he seems to either enjoy or is scared of, or both. Yuno doesn't seems to have had sex with Yukiteru at all. Yet.
Love Triangle
Ojou: Rena. She comes across as almost an Alpha Bitch, frowning upon Yuno's displays of affection towards Yukiteru. This is because she's in love with him, and is his "mistress".
Pyromaniac: Yukiteru. To the point that he burned his house down on accident as a child.
Spiritual Successor: To Aki Sora, which was discontinued in Japan due to the incestuous content and the current batch of Moral Guardians scaring the publishers.
Tall, Dark and Bishoujo: Rena
Victorious Childhood Friend: Yukiteru and Yuno. And Yukiteru and Rena. At the same time.
Yandere: Implied that Yuno is one, by her sister. So far she shown nothing worse that jealousy toward Yukiteru and Rena being too friendly.