No he is not. It has been explained that Lucaon was serious and a little cold/formal with strangers but also a very kind hearted person. BUT he is broken, half demon after a trauma when he lost his family and his lover... so now LUcaon is depressed, full of darkness and resentment and loneliness... he noticed his servant Kyon is infatuated with him so he is taking adventage of that and venting his frustrations, his anger in him, and maybe serching consolation or to relieve estress in raw unloving sex.
Tsunderes are harsh and rude and sometimes harmful but sweet kind loving afraid inside... Lucaon is ALIENATED
In my eyes, Master is tsundere.
Master is tsundere.