This was a mature manga about a guy who lived both with his sister, which happens to be a lesbian, and another girl, who is the girlfriend of her sister.

I remember the manga showed the slight incomodity about the situation, specially because the sister´s girlfriend character was overly flirting in general including him.

So it had some of the typical ecchi situations at first. This changed when the sister´s girlfriend start to get jealous about the possibility of being cheated, because of how kind and friendly her girl is with another female classmates.

Her jealousness makes her got even more flirty with the male protagonist. And she ends up crossing the line; she kiss him (not remember if they go beyond that) and gets discovered.

The poor sister of the protagonists gets seriously hurts and abandon the place. She ends up meeting a guy, who seems nice enough, and she convince herself of going with her so she can forget about what happened. She ends up having sex with the guy and decides -probably more because of her anger- that she prefers the guy than her girlfriend so she goes, breaks up with her, and I think she informs her brother than she is going to move with the guy or something like that.

So both the protagonist and her now sister ex-girlfriend are alone with themselves to lead with everything that happened.

Do some of you know the name?

Haru yo, Koi?

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