(So I'm going to put the ones i have done,Like Karkat x Female reader and Sollux X male reader! What i have done! So yeah!)
Karkat (Female reader!)
You two got a little kitten named "Coco" Karkat had got her for your birthday and you loved her!
Sollux (Male reader!)
You both got a little puppy named."Max" Sollux got him for Their Anniversary and it was like you fell in love with sollux all over again.
Mituna(I don't know cause i haven't done him....YET! so pick any gender!)
Mituna had got you a Fox that he found somewhere around the skate park,It was near Christmas! So you loved Mituna more then you did.
Kankri(Male reader)
You both got a baby kitten and you named."Simba" (LION KING PEOPLE!) and it was near your birthday! You Loved Kankri more then you already did!
Dirk(Don't know pick!)
You and him got a little Fox and you named it."Foxy" You were super happy,You loved Dirk so much more then you did before!
Dave(Don't know pick!)
You and him got a puppy and named it."Red" You loved red and thanked Dave and peppered him with kisses that's how much you loved it!
Cronus(Male reader!)
You two got a fish named."Pearl" You loved Pearl she was so pretty,You tackled Cronus to the floor and peppered him with kisses!