So based on the Orthodox viewpoint- if masturbation is done in the context of leading towards making love between a husband and wife, is it still considered to be wrong? For example, say the spouse is doing that for / to the other, leading up to the ending of making love together. I'm definitely not saying using inappropriate contentography or even doing it individually thinking of the spouse
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The canons of St John the Faster touches on these issues. Certain canons depend on interpetation. For example canon 2 of John the Faster says this:
"An assault of sensual pleasure against the heart through mentation is to be regarded as a sin not yet committed and not subject to the least penance."
In regards to masturbation he lists numerous canons. Two of those canons are not neccesarily about masturbation but something about; for those who have 'been polluted in body'. Basically seminal emission, different penance if it occurs while sleeping or awake.
Canon 8 is about masturbation where he recommends a 40 day penance of fasting.
Canon 9 is somewhat close to your question. It speaks of double masturbation, but its only applicable to when men do it to each other.
Canon 10 is the penance recommended for clergy.
Canon 11:
11. But as for women, too, if any of them has allowed herself to be kissed and felt by man, without, however, being ravished by him, let her receive the penance provided for masturbation.
The above canon is for single women. So no specific canon about married people. Interestingly by stating, "let her recieve the penance provided for masturbation" it seems all the canons for masturbation are geared towards men only.