The Master always had that lonely feeling deep down, he always pushed it away or tried to hide that it ever bothered him, he wasn't sure if the Doctor ever saw through that. He was always alone a lot more than the Doctor was. He didn't really have people there for him like the Doctor, he sometimes had people as a part of his plan. He never seemed to care about any of them and his hearts did always ache with loneliness. 
He was tired of living sometimes and tired of nobody caring that it was his damn birthday, He was crying a bit more when he walked out with the Doctor, at this point he was sure the Doctor would eventually say something.

“You've been here before?,” The Master was sure he hadn't. He didn't have the luxury of travelling where he wanted any more. Not since losing his own TARDIS’s. He had partly stolen the Doctors when he did because he was jealous, well other than trying to get off that hell hole at the end of the universe. He was looking around a bit. He wasn't sure why here to dance. He was sure that there was plenty of places that they could dance that weren't on another planet.

Really it just seemed like it was going to be hell from him with the Doctor. He soon noticed the Doctor had blocked his eyes. Great now he couldn't bloody see. Did the Doctor wish for him to trip over. He frowned. “What choice do I have, I can’t bloody see.” He mumbled. He ended up having to let the Doctor guide him, it had been a long time since he had let the Doctor do that. The drumming was threatening to get louder and louder. If he was lucky maybe he could get drunk enough to forget all that. He knew the drums would never stop. At least he was sure of that.

When the Doctor let him see where they were, he was quiet and he had been about to say of course he was in a bad mood, Why wouldn't he be. But those words didn't come from his mouth. He saw that the Doctor had done this for his birthday. He felt more tears fall. “Don’t you dare make me cry again Doctor!!” He didn't want to seem emotional in front of him. “But why do you care if its my birthday or not, nobody does and did you forget I tortured you.” It was confusing to him, why the Doctor would even do this for him.

When the Doctor handed him a drink, the Master downed it before he was pulled into dancing. He was sure he would end up drunk before the end of the night. He was sure it may be quicker than normal with how strong the alcohol was.
“Doctor… I ,” he trailed off, it had been awhile since he had danced this way. He wasn't sure how well that would go.
In between dancing the Master would keep getting drinks, he was starting to get drunk, he didn't seem to care though, nothing else went his way, so he was sure he was entitled to drink as much as he damn well wanted to. When he went to get his fourth drink he wasn't sure the Doctor could hear “I’m so lonely…. I don’t want to be tired of living, but sometimes I am.” He wiped away his tears, He was quietly saying that to himself. He downed his drink and decided to carry on dancing. Least the party wasn't turning out to be too horrible, so far Jack was staying out of his way and drinking and flirting with people that were there.

He could still barely tolerate the Doctor's cheerful attitude, he wasn't sure how the Doctor could be happy after going through so many bad things and now been stuck with him. He was thinking and hoped the Doctor hadn't heard what he said to himself. He was seeming to get into the dancing the more drunk he was though, he closed his eyes lost in it.