@Cyphycus
The most patrician ending would be that Minori and Tubasa realize their love for one another, as well as Kaho and Youtarou, the latter mostly being forced, of course), but both Minori and Tubasa have already had sex with Youtarou and find that none can compete with the man between the sheets whose deeds therein are worthy of song. Never be fear, however, as Kaho is more than happy to lend Youtarou to them for sexual purposes, provided that he be allowed to watch of course, and Youtarou naturally has no say in this matter.
The ending is Youtarou still being bossed around by everyone as a sex pet, for it is not that he has a harem, but that the harem has him.