Raki saw Clare as a big sister, and Clare saw Raki as herself when she was with Teresa, wanting to become like Teresa by caring for Raki, as Teresa had for her.
However, Raki's love and concern-protection of-for Clare, was quickly causing Clare to develop romantic feelings for Raki.
Clare first took notice of it in Rabona, where Raki protected Clare from Cid+Galk, especially Cid's advances upon Clare (ending with Raki kicking Cid in the "groin"). Also, not to mention how Raki stayed by Clare's bedside, as she was unconscious from her first encounter with the SNY. And lastly in the cathedral arc, was obviously Raki protecting Clare from execution by Galk, shield her from decapitation with his own body, gladly willing to die with Clare, he loved her like Romeo&Juliet, if Clare was to die, he'd have to die too (this is also seen by especially Riful and Dauf, but they aren't the only ones either: Alicia+Beth, Deneve+Helen, and etc). Oops, I forgot to mention... we can arguably say that Clare might have already been lewdly-romantically flirting with Raki, by mentioning her "talents", of being able to go from an aristocratic noblewoman to a flirtatious prostitute, and then directly offering to show her flirtatious prostitute's smile to raki... Does this show that Clare already have the "hots" for Raki, offering to show her seductive smile... and heck maybe even was willing-interested in doing more as well... cough cough...
Next we see it with Raki's concern for Clare when she went on the Lido "Spiderman" male AB mission, with Clare's cutely-sweet-loving light punch to Raki's forehead.
Of course then we got the Ophelia battle, with Raki's "Monty Python's defending of Clare from Opehlia, Tis but a flesh wound, you're puny attacks don't even make me itch, you *itch Ophelia!"
Clare couldn't take it anymore, Raki was too perfect, what a hunk! "Emotions of love and romance, flooding out of control, Clare orders Raki to hug her, hug her closely, smothering his face against her chest, yes, that feels good, mmm, and you can see from the suggestive satisfied and lurid smile-smirk on her face."
Also, at the same time, Raki was finally seeing her as a beautiful woman, and not merely a big sister.
Raki, finally has his perberty/hormones kicking in, seeing Clare as a lovely young lady and not a big sister, as seen by his gulping and slight blushing at being ordered to hug her, pressing his face against her soft bosom. Yes, Raki was having his own romantic feelings, timid and shy, in this new feeling of romantic interest, "Your.. your.. asking me to hug you, asking me to press my face against your chest... gulp...I... I... I'm...not.. ready... for this.. gulp... cause I like you... I REALLY like you... you know... romantically like you... Clare... gulp".
Raki's love is proven absolute for Clare, when he's traveling with Priscilla, seeking out his love, CLARE. While Priscilla was merely seen by Raki as a monster-girl to try to help out, while he could do so. We also do see Raki faithfully, pushing away Priscilla and her advances when he was with Isley training. Oh, if only Clare new just how perfect a Man, her Raki was !!! Or, maybe she does already know, he's perfect - he'd never cheat on her, hehe.
