Karkat
You and Karkat both love Disney so subjecting a Disney tat would make his mind think cute. And plus your both getting one so why no. He would then at any given moment after put your arms together and kiss you on the cheek.
"THESE ARE SO FUCKING CUTE, AND ITS JUST LIKE OUR RELATIONSHIP"
Aradia
AA was very excited with getting tattoos and really wanted a cool one. In which you both got cool ones. Now you both hold hands and show off the tattoos.
"N0 matter h0w many times I l00k at them I instantly think 0f us"
Tavros
He would be scared at first and want something small but as soon as you saw the one and looked happy about it he didn't care how scared he was. He was getting a tattoo with the love of his life and he is willing to throw himself in front of a train for you so one tattoo shouldn't be that bad. Knowing this he would keep this in mind while holding your hand while getting it done. Afterward he would be happy you got them.
"i WAS DEFINITELY SCARED OF GETTING ONE BUT I LIKE THESE TATTOOS AND I LOVE YOU TOO"
Sollux
He would feel honored getting a tattoo and would definitely get one. He loved tattoos he thinks there hot. So he thought you would find him getting one hot. But your also getting one which would make you hot as well.
"I love the dethign you choothe y/n. It maketh you look thexthy"
Nepeta
She always loved tattoos and she liked how you did to. So she hooked up an appointment with kanaya's dancestor Porrim. She then tattooed both you and NP.
"Now we match and people and back off before I pounce on them and rip them to shreds"
Kanaya
She convinced you to get a tattoo with her to be romantic. You loved kan so you went with her. She even let you pick out the tattoo.
"I love how much we love each other so much that we got matching tattoos"
Terezi
You and TZ got tattoos by being dared to by Vriska. She obviously did care but she cared if you didn't want to. So when you said yes she would schedule a appointment for a tattoo and man did she love it.
"Th3 two b1rd5 r3pr353nt u5 and how much w3 lov3 3ach oth3r"
Vriska
TZ dares Vriska after getter hers so she pulled you into it by begging you. You obliged and you both got tattoos. She loves the tattoos you both got. It just fits so well.
"8a8e look how they died together. I'll do the same for you"
Equius
He loves robots so this is why you had to go for it. At first he wasn't to keen on it but you insisted. He absolutely had to do it know. So he went threw it. He loved the fact of he can't destroy these robots.
"Well I wasn't to into the idea of these l00d things but I really like them"
Gamzee
He loves the idea of tattoos but he almost snapped at the thought of the pain you had to go through in order to get them. But you calmed him down and so you both got them.
"I GuEsS ThEy wErEnT ThAt bAd"
Eridan
He loved the idea of bonding tattoos. So he got them. He almost cried with the pain but with your hand in his he could suffer threw it.
"These wwere so wworth it"
Feferi
Fef loved you so much that when you subjected the idea of matching tats she was excited. This means no going back now. She is now committed to you in a visual way for others to see.
"See we match now your the queen of my king"