To reach max love level with the Estoc, you can run either dungeon to gain XP and also give gifts when prompted throughout the game on dates and dungeons.
Confirmed Perfect Gifts for the Estoc are (this is what I used with the Estoc; there is likely more- please comment them if you find them & I will edit):
Fine Bourbon
Sword Cufflinks
But pretty much any gift will do in combination with running the dungeons.