Emarbe, there are alternative wordings to use. For example, rather than use "comfortable" either WITH or ON or IN something, we can write or speak this way. "I find this convenient." "I am at ease with this." "This feels nice to me". "I prefer this to anything else." "This gives me much comfort." "I take comfort in this." "I take comfort with this." "I seek comfort." "Is this to your liking?" "This is very much to my liking". "This feels right." "This is more relaxing that the other."