-Richard Grayson-
If it has to be anything other than just his usual presence in general, it's when he simply uses his hand to comb back his luscious, raven black hair and bites his lip. Basically this is when he is nervous or in deep thought and every time you just have the unsettling urge to kiss him...Or slap him for doing it on purpose (which he knows it makes you blush is why he does it), whichever works.
-Jason Todd-
If it is anything that turns you on from him, it's when he whispers something into your ear. He knows it always makes you shiver every time and he always teases you by doing it, too.
-Timothy Drake-
You love it when he strokes your hair. His hands are warm and gentle and he loves to play with it. It makes you relax and feel more at peace with everything, even on your bad days. Sometimes he uses it as his advantage, however, to tug you lightly to him so he can give you a kiss ;)
-Damian Wayne-
Damian may be getting used to normal relationships and just everything in life in general, but he knows how to show more romance towards you from books and other sources of reading, sometimes tips from Dick. He usually does some cheesy things rather awkwardly. When you relax and smile about it, he usually becomes more confident in what he is doing and always wants to improve on showing you he cares. In conclusion; the Damian that has genuine (not arrogant) confidence is a total turn-on.