While at first regarding Elena as little more than one of Drake's flings, calling her 'the girl', Sully does flirt with her, showing off his 'womanizing' skills he claims to have. As the series progresses, he adopts a more caring side when he sees Elena is there to stay, helping her to walk when she's wounded (though it can be seen in the background Elena tries to push him off) and they still share banter, Sully teasing her. By the third game, he is her unofficial father-in-law, what with her marriage to his 'son', and he shows this is an attempted hug (though the laws of Yemen frown upon this) and he tries to keep Nate and Elena together, even keeping Nate's wedding ring, so it's fair to say he has become fond of her, even telling Drake to stop making his 'mistakes' and alluding her to greatness, inclining his head to her after he makes his speech at the airport.