Disclaimer: Still don't own anything, I can check though
Riddler chuckled at the surprised look on Yin's face, a far cry from his usual malicious laugh, this was a truly real and happy laugh. He seemed so different from his other personalities, the smile across his face was neither the Riddler's cold and proud smirk, nor Edward Nygma's over-adoring, almost insane grin. This was a true smile from the man behind the Riddler, a true laugh, a true man. Yin was still very surprised to say the least, he sounded so different to the Riddler she remembered, a deranged, psychopathic criminal, now he sounded nice, kind and caring. She gave a small smile herself at the happiness his face showed.
At her smile Riddler's already huge and warm smile grew, spreading out and across his entire pale face, making it even harder for him to concentrate on examining her nose. He just wanted to lean in and kiss her, here and now, but no matter how difficult it was he restrained himself, he loved his Yin and wouldn't let himself ruin it for anything, and so he stopped himself. He gently stroked his hands gently across her face, joy filling his heart and mind at this simple touch
(I'm sorry it's so short, I wish I could do more but I had a lot of GCSE coursework today )