imo tholindis wouldn't say anything about rerir's sh scars the first time she sees them. her eyebrows raise slightly and that's about it. doesn't bring it up. eventually rerir gets somewhat comfortable with fully undressing around tholindis and once they actually get in bed together, she kisses the scars one by one until all of them are covered in her lipstick stains.
as a bonus, tholindis walks in on rerir about to cut himself and asks him where he wants her to kiss him. cue rerir lowk getting conditioned into asking for kisses whenever he wants to sh
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i was more of thinking while she doesn't say he should quit, she does ask if he wants anything to ease the pain some because healed scars do still hurt if you're going deep enough. always fucking something with them.
but the kissing idea is cute. that's gonna have to be a lot of kisses but he deserves every single one. you can look at towa from slow damage to see some inspiration on what i'm thinking with his scars. they're not 1:1 but close