#like we understand what mercy's exclamtion of 'WHITE wine!' means by the next chapter

[frontlinebicepsoftheninth]

did anyone ever figure out what this quote from HTN chapter 29 meant when augustine and mercymorn were planning the threesome

"...and at one point she said, "Gradient?" and he answered, "Radial," and then they devolved again into a shorthand of facial expressions."

#like we understand what mercy's exclamtion of 'WHITE wine!' means by the next chapter #but what are gradient and radial. am i stupid is it a sex thing i've never heard of #htn #harrow the ninth #tlt #the locked tomb #tlt spoilers #the locked tomb spoilers #htn spoilers #harrow the ninth spoilers