Spend more time with your "mistress"

While you are curious, in the end you decide to go with the safest option and satiate your lust with Rikako, who seems more reciprocal this time. Instead of experimenting with many people, you experimented with a lot of things with her throughout your stay in the village, sometimes to the extent that you exhausted her or causing her to be unable to stand. You enjoy her so much that after you have finished your mission, you return back to the village to redeem her dowry only to have Kouji gives her to you for free with the excuse that he's very grateful for what you did; he's probably trying to get rid of her so he can have a more open relationship with the widow.

From Rikako's expression, it seems that she realizes it as well. However, you can see that she's very willing to follow you instead of staying with a man who doesn't appreciate her.

In the end, reeling somewhat responsible, you accept his gifting her to you, making her somewhat your attendant; you abhor thinking her as your ****. So, with her things being stored in a scroll, you carry her most of the trip home, stopping at big villages or towns for the night. Of course, you don't need two rooms, only a room with a big and sturdy bed. A seal would take care of any sound the two of you would make throughout the night.

Finally, you arrive back at Konoha and go straight to the tower. While you can simply choose not to reveal about her circumstances to other people, you still have to tell the truth to Tsunade as Rikako is technically a security risk despite being a villager. In the end, to convince Tsunade, Rikako agrees to have a seal tracking inscribed on her back despite your protest. Rather than letting anyone else, you do it yourself and inscribe an Uzumaki seal that uses your chakra and blood instead of the usual ones used by Konoha.

In a twist of fate, Rikako being your attendant means you're being recognized as an Uzumaki clan head, and with it all of your mother's heritage as well as any Uzumaki clan's holding at the village are to be surrendered to you at once. You receive a small clan compound, complete with a main house that's at least twenty times the size of your current apartment.

While that is a good news, the bad news is everyone is hounding you to find out what had happened. If you're not conceited, you would have said that few of the girls seem sad that you have Rikako in your life, even if she's not your wife.