Akane-Iro ni Somaru Saka/WMG

Yuuhi becomes "sex ambassador" between Junichi and Minato.
She doesn't want them having sex with each other, loves them both and continues to live with them even after Minato wins the harem race. Naturally, to keep sexual tension down, she'll have sex with both of them, one at a time.
 * Except that while Yuuhi loves Minato, in the very scene where she says this, she states that she is glad that she was able to meet someone she could love (Junichi) as well as very good friends that she cares about (Minato). She loves Minato, but there's not a hint of sexual attraction in their interactions.