Komatta Toki Ni Wa Hoshi Ni Kike!
It's never explicit to where the characters blush and confess to each other, but the love between them is obvious and they do kiss several times. A lot of fanservice moments <3
Shinkuu Yuusetsu
This one's a very interesting read. It's about a country where everyone is matched with a lifetime partner when they're 3-4 years old. However, being partners is different from being married as you can have both a lover and a partner (but your partner is always your most important person). Furthermore, no one places priority on love and romance, so even if two partners have have sex or develop a family, their relationship is still more platonic than anything since it comes from the mutual understanding and acceptance that they will always be together until they die.
Hokenshitsu no Target