To reach max love level with the Talwar, 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 Talwar are (this is what I used with the Talwar; there is likely more- please comment them if you find them & I will edit):
Raspberry Vodka
Dark Eyeliner
Red Rose
But pretty much any gift will do in combination with running the dungeons.