The barren world of Dark Souls III had the potential for the player to find love in the form of Anri of Astoria and even take their hand in marriage. There is now a mod that allows you to marry Anri if they are the same gender as your character.
It's possible to encounter an NPC in Dark Souls III named Anri of Astoria, whose gender will always be the opposite of what the player chose during character creation. It's possible to complete a questline that ends with the player "marrying" Anri, which involves plunging the Sword of Avowal into their chest. Completing this questline will give the player the "Usurpation of Fire" ending.
It's now possible to mod Dark Souls III so that Anri is the same gender as the player character. The Gay Marriage mod was created by a Nexus Mods user named thefifthmatt and it makes Anri's gender match the player. The mod should only be used when offline, as the presence of tampering can lead to the player receiving a permanent ban.
In order to complete the Anri marriage quest, the player needs to encounter them at the Road of Sacrifices, then again at the Firelink Shrine after defeating the Deacons of the Deep, and then again in the Catacombs of Carthus after defeating the Abyss Watcher. The player then needs to kill Horace (Anri's companion) at the Smouldering Lake and then inform Anri of the deed. The player then needs to seek out Anri in the church in Irithyll of the Boreal Valley, after which Anri will be killed. The player then needs to reach Dark Sun Gwyndolin's Chamber and seek out the old woman, who will give the player the Sword of Avowal, which can be plunged into Anri's chest.
The romance quest in Dark Souls III isn't particularly romantic by the usual video game standards unless the player is really into doom and gloom. There are no Persona-style dates where the player has to raise Social Links, nor are there segments like the fanservice scenes of games like The Witcher 3: Wild Hunt, but the Dark Souls series has always marched to the beat of its own drum. In the end, a tragic romance that ends with the player sticking a sword in the chest of their deceased spouse to be is very much consistent with the tone of the series.
The Gay Marriage mod for Dark Souls can be found on Nexus Mods here.