@Natalia Arlovskaya i think the way he said that it won't just stop at hand holding anymore probably implies that they're not kids anymore so if she got into his bed they'll do more stuff since they're mature now but their situation as a young master and maid makes it difficult to accept so he's saying to be cautious that's why she got so flustered
Lets Just Give Up And Die
Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β Β ~DAZAI OSAMUΒ