XD Sakura is all flirty and flaunting herself there... demonstrating her love to him, but Ryu is so clueless and dumbfounded. He doesn't know what to do. Great pic, love the emotions and expressions this is giving. Keep it up.
Why would he be? Dan sees Sakura only as a student and treats her as a little sister. Ryu on the other hand has very conflicted feelings concerning Sakura and doesn't see himself as even being worthy of actually being her Master. Sakura on the other hand is in love with Ryu, as per SF IV where she acknowledges her feelings for him, and sees Dan as a Master and elder brother.