If he knows that his masturbating can lead him to ejaculation by accident, his act of masturbation is a sinful act and he has to pay Kaffara along with Qadha of the fast if that day.
If ejaculation happens completely unintentionally then no Kaffara.
It is not permissible for the husband (according to obligatory precaution) to drink from the milk of his wife. Such act despite being not permissible, does not forbid the husband from sexual activities with his wife nor does it harm their marriage bond. If husband while his sexual activities with his wife gets some milk in his mouth, he should spit it out and avoid drinking it.
Semen does not gush out without your feeling it. Stain can be from other fluid which is not semen. Your fast is valid as far as you did not feel the orgasm of the ejaculation and caused it deliberately.
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